# KEK Theory Seminar( Dr. Po-Yen Tseng )

Category Theory Seminar 2020/01/28（Tue）11:00 AM 2020/01/28（Tue）12:00 PM Meeting Room 3, 1st Floor, Kenkyu-Honkan Light gauge boson interpretation for muon g-2 and J-PARC KOTO anomalies Dr. Po-Yen Tseng (Yonsei University) 英語/English Hiroyuki Ishida /ishidah-AT-post.kek.jp 利用予定なし／0

## Abstract

We discuss a list of possible light gauge boson interpretations for the long-standing experimental anomaly in $(g-2)\mu$ and also recent anomalous excess in $KL \rightarrow \pi^0 + \text{(invisible)}$ events at the J-PARC KOTO experiment. We consider two models: i) $L\mu - L\tau$ gauge boson with heavy vector-like quarks and ii) $(L\mu - L\tau) + \epsilon (B3 - L\tau)$ gauge boson in the presence of right-handed neutrinos. When the light gauge boson has mass close to the neutral pion in order to satisfy the Grossman-Nir bound, the models successfully explain the anomalies simultaneously while satisfying all known experimental constraints. We extensively provide the future prospect of suggested models.

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